Java - Dual Button Bricklet 2.0¶

Callback¶

Download (ExampleCallback.java)

 1import com.tinkerforge.IPConnection;
 2import com.tinkerforge.BrickletDualButtonV2;
 3
 4public class ExampleCallback {
 5    private static final String HOST = "localhost";
 6    private static final int PORT = 4223;
 7
 8    // Change XYZ to the UID of your Dual Button Bricklet 2.0
 9    private static final String UID = "XYZ";
10
11    // Note: To make the example code cleaner we do not handle exceptions. Exceptions
12    //       you might normally want to catch are described in the documentation
13    public static void main(String args[]) throws Exception {
14        IPConnection ipcon = new IPConnection(); // Create IP connection
15        BrickletDualButtonV2 db = new BrickletDualButtonV2(UID, ipcon); // Create device object
16
17        ipcon.connect(HOST, PORT); // Connect to brickd
18        // Don't use device before ipcon is connected
19
20        // Add state changed listener
21        db.addStateChangedListener(new BrickletDualButtonV2.StateChangedListener() {
22            public void stateChanged(int buttonL, int buttonR, int ledL, int ledR) {
23                if(buttonL == BrickletDualButtonV2.BUTTON_STATE_PRESSED) {
24                    System.out.println("Left Button: Pressed");
25                } else if(buttonL == BrickletDualButtonV2.BUTTON_STATE_RELEASED) {
26                    System.out.println("Left Button: Released");
27                }
28
29                if(buttonR == BrickletDualButtonV2.BUTTON_STATE_PRESSED) {
30                    System.out.println("Right Button: Pressed");
31                } else if(buttonR == BrickletDualButtonV2.BUTTON_STATE_RELEASED) {
32                    System.out.println("Right Button: Released");
33                }
34
35                System.out.println("");
36            }
37        });
38
39        // Enable state changed callback
40        db.setStateChangedCallbackConfiguration(true);
41
42        System.out.println("Press key to exit"); System.in.read();
43        ipcon.disconnect();
44    }
45}

Basic Functions¶

class BrickletDualButtonV2(String uid, IPConnection ipcon)¶

Parameters:	uid – Type: String ipcon – Type: IPConnection
Returns:	dualButtonV2 – Type: BrickletDualButtonV2

Creates an object with the unique device ID uid:

BrickletDualButtonV2 dualButtonV2 = new BrickletDualButtonV2("YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected.

void BrickletDualButtonV2.setLEDState(int ledL, int ledR)¶

Parameters:	ledL – Type: int, Range: See constants, Default: 1 ledR – Type: int, Range: See constants, Default: 1

Sets the state of the LEDs. Possible states are:

• 0 = AutoToggleOn: Enables auto toggle with initially enabled LED.

• 1 = AutoToggleOff: Activates auto toggle with initially disabled LED.

• 2 = On: Enables LED (auto toggle is disabled).

• 3 = Off: Disables LED (auto toggle is disabled).

In auto toggle mode the LED is toggled automatically at each press of a button.

If you just want to set one of the LEDs and don't know the current state of the other LED, you can get the state with getLEDState() or you can use setSelectedLEDState().

The following constants are available for this function:

For ledL:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

For ledR:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

BrickletDualButtonV2.LEDState BrickletDualButtonV2.getLEDState()¶

Return Object:	ledL – Type: int, Range: See constants, Default: 1 ledR – Type: int, Range: See constants, Default: 1

Returns the current state of the LEDs, as set by setLEDState().

The following constants are available for this function:

For ledL:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

For ledR:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

BrickletDualButtonV2.ButtonState BrickletDualButtonV2.getButtonState()¶

Return Object:	buttonL – Type: int, Range: See constants buttonR – Type: int, Range: See constants

Returns the current state for both buttons. Possible states are:

• 0 = pressed

• 1 = released

The following constants are available for this function:

For buttonL:

• BrickletDualButtonV2.BUTTON_STATE_PRESSED = 0

• BrickletDualButtonV2.BUTTON_STATE_RELEASED = 1

For buttonR:

• BrickletDualButtonV2.BUTTON_STATE_PRESSED = 0

• BrickletDualButtonV2.BUTTON_STATE_RELEASED = 1

Advanced Functions¶

void BrickletDualButtonV2.setSelectedLEDState(int led, int state)¶

Parameters:	led – Type: int, Range: See constants state – Type: int, Range: See constants

Sets the state of the selected LED.

The other LED remains untouched.

The following constants are available for this function:

For led:

• BrickletDualButtonV2.LED_LEFT = 0

• BrickletDualButtonV2.LED_RIGHT = 1

For state:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

BrickletDualButtonV2.SPITFPErrorCount BrickletDualButtonV2.getSPITFPErrorCount()¶

Return Object:	errorCountAckChecksum – Type: long, Range: [0 to 232 - 1] errorCountMessageChecksum – Type: long, Range: [0 to 232 - 1] errorCountFrame – Type: long, Range: [0 to 232 - 1] errorCountOverflow – Type: long, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

• ACK checksum errors,

• message checksum errors,

• framing errors and

• overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

void BrickletDualButtonV2.setStatusLEDConfig(int config)¶

Parameters:	config – Type: int, Range: See constants, Default: 3

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

For config:

• BrickletDualButtonV2.STATUS_LED_CONFIG_OFF = 0

• BrickletDualButtonV2.STATUS_LED_CONFIG_ON = 1

• BrickletDualButtonV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2

• BrickletDualButtonV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

int BrickletDualButtonV2.getStatusLEDConfig()¶

Returns:	config – Type: int, Range: See constants, Default: 3

Returns the configuration as set by setStatusLEDConfig()

The following constants are available for this function:

For config:

• BrickletDualButtonV2.STATUS_LED_CONFIG_OFF = 0

• BrickletDualButtonV2.STATUS_LED_CONFIG_ON = 1

• BrickletDualButtonV2.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2

• BrickletDualButtonV2.STATUS_LED_CONFIG_SHOW_STATUS = 3

int BrickletDualButtonV2.getChipTemperature()¶

Returns:	temperature – Type: int, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

void BrickletDualButtonV2.reset()¶

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

BrickletDualButtonV2.Identity BrickletDualButtonV2.getIdentity()¶

Return Object:

uid – Type: String, Length: up to 8 connectedUid – Type: String, Length: up to 8 position – Type: char, Range: ['a' to 'h', 'z'] hardwareVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, Range: [0 to 255] firmwareVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, Range: [0 to 255] deviceIdentifier – Type: int, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Listener Configuration Functions¶

void BrickletDualButtonV2.setStateChangedCallbackConfiguration(boolean enabled)¶

Parameters:	enabled – Type: boolean, Default: false

If you enable this listener, the StateChangedListener listener is triggered every time a button is pressed/released

boolean BrickletDualButtonV2.getStateChangedCallbackConfiguration()¶

Returns:	enabled – Type: boolean, Default: false

Returns the configuration as set by setStateChangedCallbackConfiguration().

Listeners¶

Listeners can be registered to receive time critical or recurring data from the device. The registration is done with add*Listener() functions of the device object.

The parameter is a listener class object, for example:

device.addExampleListener(new BrickletDualButtonV2.ExampleListener() {
    public void property(int value) {
        System.out.println("Value: " + value);
    }
});

The available listener classes with inherent methods to be overwritten are described below. It is possible to add several listeners and to remove them with the corresponding remove*Listener() function.

class BrickletDualButtonV2.StateChangedListener()¶

This listener can be added with the addStateChangedListener() function. An added listener can be removed with the removeStateChangedListener() function.

void stateChanged(int buttonL, int buttonR, int ledL, int ledR)

Parameters:	buttonL – Type: int, Range: See constants buttonR – Type: int, Range: See constants ledL – Type: int, Range: See constants ledR – Type: int, Range: See constants

This listener is called whenever a button is pressed.

Possible states for buttons are:

• 0 = pressed

• 1 = released

Possible states for LEDs are:

• 0 = AutoToggleOn: Auto toggle enabled and LED on.

• 1 = AutoToggleOff: Auto toggle enabled and LED off.

• 2 = On: LED on (auto toggle is disabled).

• 3 = Off: LED off (auto toggle is disabled).

This listener can be enabled with setStateChangedCallbackConfiguration().

The following constants are available for this function:

For buttonL:

• BrickletDualButtonV2.BUTTON_STATE_PRESSED = 0

• BrickletDualButtonV2.BUTTON_STATE_RELEASED = 1

For buttonR:

• BrickletDualButtonV2.BUTTON_STATE_PRESSED = 0

• BrickletDualButtonV2.BUTTON_STATE_RELEASED = 1

For ledL:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

For ledR:

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_ON = 0

• BrickletDualButtonV2.LED_STATE_AUTO_TOGGLE_OFF = 1

• BrickletDualButtonV2.LED_STATE_ON = 2

• BrickletDualButtonV2.LED_STATE_OFF = 3

Virtual Functions¶

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

short[] BrickletDualButtonV2.getAPIVersion()¶

Return Object:	apiVersion – Type: short[], Length: 3 0: major – Type: short, Range: [0 to 255] 1: minor – Type: short, Range: [0 to 255] 2: revision – Type: short, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

boolean BrickletDualButtonV2.getResponseExpected(byte functionId)¶

Parameters:	functionId – Type: byte, Range: See constants
Returns:	responseExpected – Type: boolean

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For listener configuration functions it is enabled by default too, but can be disabled by setResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

• BrickletDualButtonV2.FUNCTION_SET_LED_STATE = 1

• BrickletDualButtonV2.FUNCTION_SET_SELECTED_LED_STATE = 5

• BrickletDualButtonV2.FUNCTION_SET_STATE_CHANGED_CALLBACK_CONFIGURATION = 6

• BrickletDualButtonV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237

• BrickletDualButtonV2.FUNCTION_SET_STATUS_LED_CONFIG = 239

• BrickletDualButtonV2.FUNCTION_RESET = 243

• BrickletDualButtonV2.FUNCTION_WRITE_UID = 248

void BrickletDualButtonV2.setResponseExpected(byte functionId, boolean responseExpected)¶

Parameters:	functionId – Type: byte, Range: See constants responseExpected – Type: boolean

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and listener configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

• BrickletDualButtonV2.FUNCTION_SET_LED_STATE = 1

• BrickletDualButtonV2.FUNCTION_SET_SELECTED_LED_STATE = 5

• BrickletDualButtonV2.FUNCTION_SET_STATE_CHANGED_CALLBACK_CONFIGURATION = 6

• BrickletDualButtonV2.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237

• BrickletDualButtonV2.FUNCTION_SET_STATUS_LED_CONFIG = 239

• BrickletDualButtonV2.FUNCTION_RESET = 243

• BrickletDualButtonV2.FUNCTION_WRITE_UID = 248

void BrickletDualButtonV2.setResponseExpectedAll(boolean responseExpected)¶

Parameters:	responseExpected – Type: boolean

Changes the response expected flag for all setter and listener configuration functions of this device at once.

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

int BrickletDualButtonV2.setBootloaderMode(int mode)¶

Parameters:	mode – Type: int, Range: See constants
Returns:	status – Type: int, Range: See constants

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

For mode:

• BrickletDualButtonV2.BOOTLOADER_MODE_BOOTLOADER = 0

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE = 1

• BrickletDualButtonV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

• BrickletDualButtonV2.BOOTLOADER_STATUS_OK = 0

• BrickletDualButtonV2.BOOTLOADER_STATUS_INVALID_MODE = 1

• BrickletDualButtonV2.BOOTLOADER_STATUS_NO_CHANGE = 2

• BrickletDualButtonV2.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3

• BrickletDualButtonV2.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4

• BrickletDualButtonV2.BOOTLOADER_STATUS_CRC_MISMATCH = 5

int BrickletDualButtonV2.getBootloaderMode()¶

Returns:	mode – Type: int, Range: See constants

Returns the current bootloader mode, see setBootloaderMode().

The following constants are available for this function:

For mode:

• BrickletDualButtonV2.BOOTLOADER_MODE_BOOTLOADER = 0

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE = 1

• BrickletDualButtonV2.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3

• BrickletDualButtonV2.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

void BrickletDualButtonV2.setWriteFirmwarePointer(long pointer)¶

Parameters:	pointer – Type: long, Unit: 1 B, Range: [0 to 232 - 1]

Sets the firmware pointer for writeFirmware(). The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

int BrickletDualButtonV2.writeFirmware(int[] data)¶

Parameters:	data – Type: int[], Length: 64, Range: [0 to 255]
Returns:	status – Type: int, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by setWriteFirmwarePointer() before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

void BrickletDualButtonV2.writeUID(long uid)¶

Parameters:	uid – Type: long, Range: [0 to 232 - 1]

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

long BrickletDualButtonV2.readUID()¶

Returns:	uid – Type: long, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

Constants¶

int BrickletDualButtonV2.DEVICE_IDENTIFIER¶

This constant is used to identify a Dual Button Bricklet 2.0.

The getIdentity() function and the IPConnection.EnumerateListener listener of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

String BrickletDualButtonV2.DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a Dual Button Bricklet 2.0.